Add RecordingChunkIterableDataset #985
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It scales pretty much linearly, on a local SSD I'm loading 3h of audio in one second with 4 workers (batch_size=32 * chunk_size=5s * 91 it/s / 3600s ~= 3h 14min, some of it overlapped), not a bad result...
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CC @danpovey this is what I suggest to efficiently load chunks of long recordings. I just need to add support for chunk_shift to fit your requirements.
Resolves #983